Structural Elucidation of an Atropisomeric Entcassiflavan-(4β→8)-Epicatechin Isolated from Dalbergia monetaria L.f. Based on NMR and ECD Calculations in Comparison to Experimental Data.

Patrícia Homobono Brito de Moura, Wolfgang Brandt, Andrea Porzel, Roberto Carlos Campos Martins, Ivana Correa Ramos Leal, Ludger A Wessjohann

Molecules (Basel, Switzerland) 2022 Apr 13

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A rare dihydoxyflavan-epicatechin proanthocyanidin, entcassiflavan-(4β→8)-epicatechin, was isolated from Dalbergia monetaria, a plant widely used by traditional people from the Amazon to treat urinary tract infections. The constitution and relative configuration of the compound were elucidated by HR-MS and detailed 1D- and 2D-NMR measurements. By comparing the experimental electronic circular dichroism (ECD) spectrum with the calculated ECD spectra of all 16 possible isomers, the absolute configuration, the interflavan linkage, and the atropisomers could be determined.

Citation

Patrícia Homobono Brito de Moura, Wolfgang Brandt, Andrea Porzel, Roberto Carlos Campos Martins, Ivana Correa Ramos Leal, Ludger A Wessjohann. Structural Elucidation of an Atropisomeric Entcassiflavan-(4β→8)-Epicatechin Isolated from Dalbergia monetaria L.f. Based on NMR and ECD Calculations in Comparison to Experimental Data. Molecules (Basel, Switzerland). 2022 Apr 13;27(8)